[chessmind] Dennis Monokroussos: A swindle with a twist

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Posted by Dennis Monokroussos:
A swindle with a twist
http://chessmind.powerblogs.com/posts/1214671889.shtml


   Here's a puzzle sent to me by an anonymous reader, from a recent
   5-minute game he(?) won:
   [6_8_swindle_with_refutation.jpg]
   White, down a piece for next to nothing, has just played 27.Bc3-d2.
   The move doesn't threaten anything, but Black now goes into helpmate
   mode: 27...Ng5 28.Bxg5+ Kxg5 29.Rxe6 Kxh4 30.g3+ Kg5 31.Rg6#. Here's
   the question/puzzle: what was the last moment where Black could save
   himself? Try to figure it out without software assistance, and I'll
   supply the answer in a couple of days.